Clinical efficacy of transjugular intrahepatic portosystemic shunt for gastrointestinal hemorrhage in patients with idiopathic noncirrhotic portal hypertension / 中华内科杂志

Objective:To explore the medium-long term efficacy of transjugular intrahepatic portosystemic shunt (TIPS) for gastrointestinal hemorrhage in patients with idiopathic non-cirrhotic portal hypertension (INCPH).Methods:From March 2013 to July 2018, clinical data of 13 INCPH patients, including 5 males, 8 females,with gastrointestinal hemorrhage were retrospectively analyzed, who were diagnosed at the First Affiliated Hospital of Zhengzhou University, Anyang Fifth People′ s Hospital and Yuncheng Central Hospital. All patients received TIPS treatment. The general information, postoperative survival rate, the incidence of rebleeding, shunt dysfunction rate, and incidence of hepatic encephalopathy were analyzed.Results:All 13 patients with INCPH completed TIPS successfully with an average age of 45±8 (33 to 59) years. The hepatic venous pressure gradient (HVPG) decreased from 20.0-26.0 (22.6±1.9) mmHg before procedure to 8.0-14.0 (9.4±3.2) mmHg after. The median follow-up time was 44±7 (31 to 53) months. One patient died of liver failure 27 months after TIPS. Hepatic encephalopathy occurred cumulatively in 1 case (1/13), 1 case (1/13) and 1 case (1/13) in 12, 24 and 36 months after TIPS. Stent restenosis occurred cumulatively in 2 cases (2/13), 3 cases (3/13) and 3 cases (3/13) in 12, 24 and 36 months after TIPS. Portal vein thrombosis occurred cumulatively in 2 cases (2/13), and no primary liver cancer developed.Conclusions:TIPS is safe and effective in the treatment of INCPH with gastrointestinal bleeding with favorable medium-long term outcome.

Implantation Strategies of Invasive Flexible Neural Electrode / 医用生物力学

Invasive neural electrodes promote human understanding of neuroscience to the micrometer and millisecond scale. Due to the large mechanical mismatch between traditional rigid electrodes and soft brain tissues, flexible electrodes have become the new trend of neural electrodes. The flexibility of the neural electrode reduces the immune response while losing the implantation stiffness. The implantation mechanism of the neural electrode was reviewed and current researches on the implantation strategies of the flexible electrodes were summarized, so as to help solve the loss of implantation ability of flexible electrode and acute implantation injury. Based on the characteristics of various implantation strategies, the prospect of flexible electrode implantation strategies was proposed.

Clinical analysis of castor branch integrated stent in the treatment of aortic dissection and aneurysm / 中华放射学杂志

Objective:To explore the safety and efficacy of Castor branched stent-graft exclusion in the treatment of aortic dissection and aneurysm involving left subclavian artery.Methods:The clinical and imaging data of 88 patients with aortic dissection or aneurysm involving left subclavian artery diagnosed by CTA or DSA in our hospital from December 2017 to December 2019 were collected retrospectively, including 67 aorta dissections, 7 thoracic aortic aneurysms and 14 aorta penetrating ulcer. All patients were treated with branched stent-graft under the guidance of DSA. The postoperative curative effect and complications were observed. The paired t test was used to compare the maximum aortic diameter of the lesion before and 6 months after the operation. Results:Eighty-eight patients were successfully treated with integrated stent, the success rate of operation was 100%, and the disease-related symptoms of all patients were basically or completely relieved. The mortality rate within 1 month after the operation was 2.7% (2/88). The two deaths were complicated with other serious diseases before the operation, and the cause of death was not related the operation. All patients were followed up except 4 patients who lost contact after discharge. During the follow-up, there were 1 case of retrograde type A dissection, 1 case of new aneurysm of aortic arch, 2 cases of in-stent stenosis of left subclavian artery branch, 3 cases of mild stroke, no persistent endoleak and no death or other serious complications. The mean maximum aortic diameter at 6 months after operation [(34±4)mm] was significantly lower than that before operation [(38±6 mm)] ( t=6.63, P<0.05). Conclusion:Castor branched stent-graft is simple, mini-invasive and effective in the treatment of aortic dissection and aneurysms involving the left subclavian artery.

Study on the enhanced morphology around MRI after DEB-TACE in primary hepatocellular carcinoma / 中华肝胆外科杂志

Objective:To investigate the morphological feature and clinical significance of MRI around tumor after drug-eluting bead transcatheter arterial chemoembolization (DEB-TACE) of primary hepatocellular carcinoma.Methods:We reviewed and analyzed the data of hepatocellular carcinoma patients admitted from January 2017 to December 2018 in the Department of Radiological Intervention of the First Affiliated Hospital of Zhengzhou University. A total of 42 patients were enrolled, including 35 males and 7 females, aged (57.0±11.9) years. For the first time after operation, MRI enhancement showed peri-tumor margin enhancement as the starting point of follow-up. Follow-up and measure enhanced edge thickness, delayed enhancement, progression or remission data.Results:A total of 49 tumors and 84 peritumoral enhancement margins were included in 42 patients, with 30 sharp type , 40 rough type and 14 nodular type. The thickness of sharp type is less than that of rough type and nsodular type, and the differences were statistically significant (all P<0.05). The sharp type is the majority of the tumors with maximum diameter <5 cm, rough type and nodule type are the majority of tumors with maximum diameter ≥5 cm. Most of the sharp type are continuously enhanced, while the rough type and nodular type are not. Most sharp type relief (93.3%, 28/30), while rough type (80.0%, 32/40) and nodular type ( n=12) are mostly of deterioration, the differences are statistically significant (all P<0.05). Conclusion:Compared with the rough type and nodular type, the sharp type usually occurs in smaller tumors and more prone to local mitigation in the enhanced morphology around MRI after DEB-TACE in primary hepatocellular carcinoma.

Efficacy of percutaneous transhepatic biliary drainage combined with balloon dilatation in the treatment of benign biliary-enteric anastomosis stricture / 中华肝胆外科杂志

Objective:To evaluate the curative effect, safety and feasibility of percutaneous transhepatic cholangio drainage(PTCD) combined with balloon dilatation in treating benign biliary-enteric anastomosis stricture(BBES).Methods:The clinical data of 33 patients with benign biliary-enteric anastomosis stricture, who were admitted to the First Affiliated Hospital of Zhengzhou University during the period from January 2013 to May 2019, were retrospectively analyzed. There were 23 cases of benign etiology and 10 cases of malignant etiology, benign strictures of which 15 cases were located in the hepatic hilum and of which 18 cases outside of it. All patients were considered as benign stenosis by at least two imaging examinations of magnetic resonance imaging of pancreatic or enhanced MRI or enhanced CT, laboratory examinations of tumor markers and other clinical data before operation. 10 cases of malignant etiology were confirmed by intraoperative biopsy and pathology. All patients were treated with balloon dilatation at an interval of 1 to 4 weeks after PTCD. The changes of clinical symptoms, bilirubin and liver function before and after operation were compared and analyzed, and the postoperative complications and anastomotic patency rate were followed up.Results:PTCD combined with balloon dilatation was performed successfully in all patients, and the success rate was 100%. After operation, the benign biliary-enteric anastomosis stricture was significantly improved in all patients, and the clinical symptoms were improved obviously. The liver function and bilirubin decreased significantly in all patients after operation, and there was significant statistical significance ( P<0.05). There is no serious complications such as biliary bleeding and biliary fistula were found after operation. At 3 months, 6 months, 12 months, 24 months and 36 months after operation, the anastomotic patency rates of all patients were 90.9%(30/33), 72.7%(24/33), 63.6%(21/33), 63.6%(21/33), 60.6%(20/33), respectively. During the whole follow-up period, anastomotic restenosis happened in 13 patients, of which 9 cases with restenosis, the benign stenosis site of the anastomosis was the hepatic hilum and of which 4 cases located on the outside of the hepatic hilum. After treatment, the incidence of benign restenosis of the anastomosis at the hepatic hilum (60.0%, 9/15) was higher than that at outside of the hepatic hilum (22.2%, 4/18) and it's statistically significant ( P<0.05). Among the 13 patients with recurrence of BBES, 4 cases underwent choledochojejunostomy for malignant causes and 9 cases with benign causes. The recurrence rates after the first balloon dilatation were 40.0% (4/10) and 39.1% (9/23), respectively, and the average recurrence time was 5.8 months and 6.8 months respectively, the difference was not statistically significant( P>0.05). Conclusion:For the treatment of benign biliary-enteric anastomosis stricture, percutaneous transhepatic cholangio drainage combined with balloon dilatation with reliable curative effect, with high safety and less trauma, with less operative complications, and with repeatability, so it is worth applying in clinic.

Evaluation on Mechanical Comprehensive Performance of Flexible Neural Electrodes Modified by Coatings / 医用生物力学

Objective To evaluate mechanical comprehensive performance of the flexible neural electrode with coating modification, so as to provide references for optimal design of the electrode and coating parameters. Methods Simplified mechanical models were established for the contact phase, implantation phase and micromotion phase. The electrode material was polyimide, the coating material was PEG, and PDMS mold injection method was selected as the coating method. The coating thickness gradients were set as 40, 80, 120, 160 and 200 μm, respectively, and the three factors (the critical load, the maximum total deformation and the maximum strain of brain tissues) were comprehensively evaluated. Results As the thickness increased, the critical load increased, the maximum total deformation and the maximum strain of brain tissues decreased, but meanwhile, the strain area of brain tissues increased. For consideration of equilibrium for three factors, 200 μm was chosen as optimal thickness of the coating. At this thickness, the critical load was 17.9 mN, the maximum total deformation was 10.1 μm, and the maximum strain of brain tissues was 0.011 4. Conclusions The coating thickness had a great influence on mechanical properties of the neural electrode. The optimal parameters could be selected by setting influencing factors from the mechanical performance factors under specific case. The optimal parameter selection of coating can improve the electrode performance, which is of great significance for clinical application of the neural electrode.

ImprovingMycoplasma ovipneumoniae culture medium by a comparative transcriptome method

Mycoplasma ovipneumoniae (Mo) is difficult to culture, resulting in many difficulties in related research and application. Since nucleotide metabolism is a basic metabolism affects growth, this study conducted a “point-to-point” comparison of the corresponding growth phases between the Mo NM151 strain and theMycoplasma mycoides subsp. capri (Mmc) PG3 strain.The results showed that the largest difference in nucleotide metabolism was found in the stationary phase. Nucleotide synthesis in PG3 was mostly de novo, while nucleotide synthesis in NM151 was primarily based on salvage synthesis. Compared with PG3, the missing reactions of NM151 referred to the synthesis of deoxythymine monophosphate. We proposed and validated a culture medium with added serine to fill this gap and prolong the stationary phase of NM151. This solved the problem of the fast death of Mo, which is significant for related research and application.

Clinicalefficiencyofendovascularinterventionaltherapyforthesolitarykidneywithrenalaneurysm / 实用放射学杂志

Objective Toanalyzetheclinicalefficiencyofendovascularinterventionaltherapyinthetreatmentofsolitarykidney withrenalaneurysm.Methods FromJune2014toDecember2017,7casesofsolitarykidneypatientscombinedwithrenalaneurysm werecollected,including4casesofrenalaneurysmlocatedinthemainrenalartery,1caseinrenalsegmentalarteryand2casesinthe renalparenchyma.4casesofmainrenalarteryaneurysmsweretreatedwithstentimplantation;1caseofrenalsegmentalarteryaneurysm was treatedwithstent-assistedcoilembolization;2casesofrenalparenchymaaneurysm wererespectivelytreatedwithpolyvinylalcohol (PVA)embolizationandPVA withcoilembolization.After1month,3months,6monthsandevery6months,therenaldopplerexamination,blood routine,urineroutine,renalfunctionandotherbiochemicalexaminationswerereviewed,andrenalarterialCTAorrenalangiographywereperformed whennecessary.Results Thesuccessrateofoperationwas100%in7solitarykidneypatientswithrenalaneurysm,andtheaneurysmswere graduallyreducedafteroperationwithoutseriousadversereactionsandcomplications.Norecanalizationorrecurrenceofrenalaneurysmwasfound duringthefollow-up,andtherenalfunctionwasbetterthanbefore.Conclusion Endovascularinterventionaltherapyinthetreatment ofsolitarykidneywithrenalaneurysmisminimallyinvasiveandlessrisky.Anditismoretargetedandflexibleforthetreatmentof solitarykidneywithdifferenttypesofrenalaneurysm.

Effect of PCI on left ventricular remodeling, oxidative stress and cardiac function after acute myocardial infarction / 中华老年心脑血管病杂志

Objective To study the effect of PCI on left ventricular remodeling,oxidative stress and cardiac function after acute myocardial infarction (AMI).Methods One hundred and sixty-nine AMI patients were divided into PCI group (n=85) and control group (n=84).Their serum cTnⅠ,NT-proBNP,GSH,SOD levels and LVEF were measured,and their symptom and sign scores were recorded after 15 days and 6 months of PCI.Results The serum NT-proBNP level was significantly lower while the LVEF and symptom and sign scores were significantly higher in PCI group than in control group after 6 months of PCI (227.2±52.5 ng/L vs 443.3±59.2 ng/L,44.7％±6.2％ vs 38.2％±5.3％,5.7±1.4 vs 10.4±2.7,P=0.000).The serum cTnⅠ level was significantly lower in PCI group than in control group after 15 days of PCI (1.15±0.29 μg/L vs 2.41±0.36 μg/L,P=0.000).No significant difference was found in SOD and GSH between the two groups (P＞0.05).The readmission rate was 23.53％ and the total effective rate was 94.12％ in PCI group while the readmission rate was 46.43％ and the total effective rate was 71.43％ in control group after 6 months of PCI (P＜0.05).Conclusion PCI can reduce the oxidative stress,reverse the left ventricular remodeling,improve the outcome and reduce the readmission rate in early AMI patients.

Effects of PVA-H Coating Thickness and Tip Angle on Tissue Injury / 医用生物力学

Objective To study the effects of PVA-H coating thickness and tip angle on the tissue injury caused by the implantation of neural electrodes. Methods Simulated implantation experiments were conducted based on a tissue injury evaluation system to evaluate the tissue injury caused by electrode implantation. The coating thicknesses were controlled by the number of dip coating times (0, 1, 2, and 3), whereas the tip angles were set as 30°, 40°, and 50°. The maximum tissue strain and insertion force were selected as the measurement of the tissue injury. Results thicker hydrogel coating and larger tip angle would cause more serious tissue injury. Simultaneously, reducing the tip angle of the neural electrode could reduce the degree of the hydrogel coating effect on the tissue injury. When the tip angle was 30°, the maximum strain and the peak insertion force increased by 3.4% and 3.8%, respectively, whereas when the wedge angle was 60°, the maximum strain and maximum insertion force increased by 11.3% and 18.1%, respectively. Conclusions The hydrogel coating of the neural electrode increased the injury of biological tissues caused by the implantation of the neural electrode. However, the method of decreasing the tip angle of the electrode could reduce the degree of the negative effects of the hydrogel coating thickness on the implantation injury.

Endovascular interventional therapy for Cockett syndrome associated with deep vein thrombosis of left lower extremity / 介入放射学杂志

Objective To evaluate the clinical effect of endovascular interventional therapy in treating Cockett syndrome associated with deep vein thrombosis (DVT) of left lower extremity.Methods The clinical data of a total of 256 patients with Cockett syndrome complicated by DVT of left lower extremity,who were admitted to authors' hospital during the period from January 2011 to January 2015,were retrospectively analyzed.The patients were treated with catheter-directed thrombolysis,balloon dilatation of the occluded or narrowed venous segment,and/or stent implantation.The circumference differences of the affected limbs before and after treatment and the long-term patency rates were compared.Results Of the 256 patients with Cockett syndrome complicated by DVT of left lower extremity,complete dissolution of thrombus was achieved in 232 (90.6％) and partial dissolution of thrombus in 24 (9.4％).The circumference difference of thigh and calf was (7.12±2.15) and (4.57±2.81) cm respectively before and after treatment.Iliac vein reconstruction was carried out in 206 patients,among them simple balloon dilatation was employed in 46 and balloon dilatation together with stent implantation was adopted in 160.The patients were followed up for 9-24 months with a mean of 15 months.In simple balloon dilatation group,3 patients lost touch with the authors during the following-up period,26 patients (60.5％) developed iliac vein occlusion and post-embolization syndrome occurred in 21 patients (48.8％).In balloon dilatation plus stent implantation group,11 patients lost touch with the authors during the following-up period,stenosis or occlusion of the stent was seen in 13 patients (8.7％),post-embolization syndrome was observed in 15 patients (10.1％).The differences in vascular stenosis or occlusion and in the occurrence of post-embolization syndrome between the two groups were statistically significant (P＜0.001).Conclusion For the treatment of Cockett syndrome complicated by DVT of left lower extremity,catheter-directed thrombolysis and balloon dilatation combined with stent implantation carry definite clinical curative effect.

Metal stent implantation in treatment of portal vein cavernous transformation / 实用放射学杂志

Objective To explore the efficacy and safety of percutaneous transhepatic portal vein or transjugular intrahepatic portosystemie shunt (TIPS)to implant the portal vein metallic stent in treatment of cavernous transformation of portal vein (CTPV).Methods Clinical and imaging data of 8 patients with CTPV were retrospectively analyzed who were treated in our hospital.All patients were treated with metallic stent implantation in portal vein including 3 patients by TIPS and 5 by percutaneous transhepatic portal vein.Results All patients were successful in the stent implantation without any occurrence of serious complications such as intra-abdominal hemorrhage and so on.Intraoperative angiography showed blood circulated freely in these stents.1 day-2 weeks later,the patients symptoms of abdominal pain and gastrointestinal bleeding were obviously relieved or disappeared.Follow up 1 month-3 years,1 patient with stent occlusion after one year of operation,the blood flow recovery after stent reimplantation,and the remaining patients,color doppler ultrasound reflected patency of blood flows in their stents.No one suffered from gastrointestinal bleeding or abdominal pain again.Conclusion Implantation of portal vein metallic stent via percutaneous transhepatic portal vein or via TIPS in treatment of cavernous transformation of portal vein is safe and effective.

Effect of aquaporin 9 on proliferation, apoptosis, invasiveness and migration of HepG2 cells / 中华肝脏病杂志

<p><b>OBJECTIVE</b>To investigate the impact of aquaporin 9 (AQP9) on the proliferation,apoptosis,invasiveness and migration of hepatocellular carcinoma cells using the HepG2 cell line.</p><p><b>METHODS</b>A lentiviral vector targeting the coding region of human AQP9 was constructed. The recombinant lentiviral vector was harvested from the 293T cell line and transfected into the HepG2 cell line; resistant cell clones were selected with puromycin. Three groups of cells were established, including the CC group (control without lentiviral vector), the PWPI group (control with empty carrier virus), and the AQP9 overexpression group (experimental with the AQP9 recombinant virus). Transfection efficiency was validated by laser confocal microscopy.Expression of AQP9 was detected in the transfected HepG2 cells by westem blotting (protein) and real-time qPCR (mRNA). AQP9 effects on proliferation, migration, invasion and apoptosis of the HepG2 cell line were assessed by plate colony formation assay, woumd healing assay, transwell assay and flow cytometry.</p><p><b>RESULTS</b>The green fluorescent protein of the recombinant lentiviral vector was appropriately distributed in the cell membrane. The AQP9 overexpression group showed significantly higher AQP9 mRNA and protein levels than the PWPI group and the CC group (both P < 0.01). Cells with AQP9 overexpression showed a lower colony formation rate (16.93±3.19% vs. CC group: 23.53±2.10% and PWPI group: 23.00±2.02%; F=6.46, P=0.032) and a lower overall apoptosis rate (44.96±3.53% vs. CC group:19.7±2.49% and PWPI group: 24.37±2.38%; F=66.88, P < 0.01). The AQP9 overexpression group also showed significantly higher number of cells in the G1 stage and significantly lower number of cells in the S stage (G1: 66.58±0.99% and S:15.25±1.81%), significantly smaller cell migration distance (P=0.01 < 0.05), and significantly suppressed invasiveness (17±8 vs. CC group:109+/-9 and PWPI group: 95±11; P=0.01 < 0.05).</p><p><b>CONCLUSION</b>In HepG2 cells, AQP9 significantly reduces the migrative and invasive capabilities, induces cell apoptosis, and inhibits cell proliferation via cell cycle arrest at the G1/S phases.</p>

Research Progress in the Core Proteins of the Classical Swine Fever Virus / 病毒学报

The core protein (CP) of the classical swine fever virus (CSFV) is one of its structural proteins. Apart from forming the nucleocapsid to protect internal viral genomic RNA, this protein is involved in transcriptional regulation. Also, during viral infection, the CP is involved in interactions with many host proteins. In this review, we combine study of this protein with its disorders, structural/functional characteristics, as well as its interactions with the non-structural proteins NS3, NS5B and host proteins such as SUMO-1, UBC9, OS9 and IQGAP1. We also summarize the important part played by the CP in CSFV pathogenicity, virulence and replication of genomic RNA. We also provide guidelines for further studies in the CP of the CSFV.

Inhibiting effect of AQP9 over-expression on the growth of hepatoma carcinoma SMMC-7721 cells subcutaneously transplanted in nude mice and its possible mechanism / 肿瘤

Objective: To investigate the effect of aquaporin 9 (AQP9): on the growth of human hepatoma carcinoma SMMC-7721 cells in nude mice and its possible mechanism. Methods: SMMC-7721 cells were infected with recombinant lentivirus LV-AQP9 (empty lentivirus LV-CFP as a negative control). The infection efficiency of recombinant lentivirus LV-AQP9 in SMMC-7721 cells was observed under a laser scanning confocal microscope, and the expression levels of AQP9 mRNA and protein were detected by real-time fluorescence-based quantitative PCR and Western blotting, respectively. The apoptosis of SMMC-7721 cells was analyzed by FCM and 4, 6-diamidino-2-phenylindole (DAPI): staining, respectively. The proliferation ability of SMMC-7721 cells was analyzed by cell counting kit-8 (CCK-8). Recombinant hepatoma carcinoma SMMC-7721/LV-AQP9 (AQP9 group): and SMMC-7721/LVCFP cells (CFP group): were subcutaneously implanted in nude mice. The volume and growth rate of the xenograft tumors were observed. Pathological alteration in xenograft tumors and lung tissues were observed by HE-staining. The expression level of proliferating cell nuclear antigen (PCNA): protein was detected by immunohistochemical staining. Results: The infection efficiency of recombinant lentivirus LV-AQP9 in SMMC-7721 cells was about 90% under a laser scanning confocal microscope. The AQP9 mRNA and protein expression levels in SMMC-7721 cells were significantly increased (both P < 0.01). AQP9 over-expression could significantly promote the apoptosis of SMMC-7721 cells (P < 0.05), and significantly inhibit the proliferation of SMMC-7721 cells at different time points (48-96 h): after transfection (all P < 0.05). The results of ANOVA for repeated measurement of xenograft tumor volume displayed that xenograft tumor volume of AQP9 over-expression group was smaller than that of CFP group, and the growth rate was slower (Fgroup = 79.161, Pgroup = 0.000; Ftime = 101.965, Ptime, = 0.000; Fgroupxtime = 18.481, Fgroupxtime = 0.002). Immunohistochemistry staining showed that the expression level of PCNA protein in the xenograft tumor of over-expression group significantly decreased compared with that of the control group. Conclusion: AQP9 over-expression can inhibit the growth of xenografts of human hepatoma carcinoma SMMC-7721 cells in nude mice and possibly conduct dual control by promoting apoptosis and inhibiting the proliferation, which provides the foundation for further research on molecular mechanism, and it is expected to become a new target for cancer treatment.

Effects of up and down-regulation of Cox-2 expression on radiation sensitivity of human esophageal cancer EC9706 xenograft in nude mice / 中华放射医学与防护杂志

Objective To explore the effects of up-and down-regulation of Cox-2 expression on the growth and radiation sensitivity of human esophageal cancer EC9706 xenograft in nude mice.Methods Cox-2 specific siRNA and Cox-2 gene eukaryotic expression vector were constructed and transfected to esophageal cancer cells EC9706, and the stable transfected cell lines were obtained by the method of G418 screening.The expressions of Cox-2 mRNA and its protein were detected by RT-PCR and Western blot, respectively.The inhibitory effects of Cox-2 regulation combined with X-ray irradiation on cancer cell growth were detected by the nude mouse xenograft assay.Results Cox-2 gene expression was significantly decreased in the Cox-2 down-regulated group and increased in the Cox-2 up-regulated group.Compared with the control group without gene transfer, the average volumes of EC9706 xenograft tumor in the Cox-2 up-and down-regulated group significantly decreased (F =34.26, P ＜ 0.05) and increased (F =26.38, P ＜ 0.05) , respectively.After 20 Gy X-ray irradiation, the average volume of xenograft was significantly reduced in the Cox-2 down-regulated group (F =16.35, P ＜ 0.05) , but it had no significantly changes in the Cox-2 up-regulated group.Conclusions Down-regulation of Cox-2 expression inhibits the growth of human esophageal cancer EC9706 xenograft in a nude mice and increases cell radiation sensitivity, but upregulation of Cox-2 expression makes tumor cells to become radioresistant.

Preparation and characteristics of patterned TiO_2 thin film on TC4 made by sol-gel method / 医用生物力学

Objective To improve the long-term biocompatibility and mechanical stability of Titanium alloy implants.Method Micro-nano patterned TiO_2 thin films have been prepared on TC4 substrates via a sol-gel dipcoating method with Ti(OC_4H_9)_4(TEOT)as precursor and polyethylene glycol(PEG)as organic template.The Influence of PEG concentration upon the morphology of the target films has been studied by using AFM.The wettability and tribological properties of the target films have been studied by means of optical contact angle measuring instrument and UMT-2.Results When increasing the PEG concentration to 3.5 g/100 mL,a parallel arranged groove structure can be obtained on the surface of the sample;compared with TiO_2 sol-gel film without adding organic template,the wear resistance of the patterned film is better.Conclusions The feature of the patterned TiO_2 films can be controlled by adding different amount of Organic template;and it has been proved that a certain kind of patterned structure can imeprove the wear resistance of the film.

Bionic design of articular cartilage / 生物医学工程学杂志

Natural articular cartilage is well known as a special connective tissue with multiple effects and functions, which are important and irreplaceable, in human synovial joints. Biomedical, histological and pathological characteristics of articular cartilage, as well as biomaterial, biomechanical and bio-tribological properties thereof, are summarized from a novel aspect of bionics. Bionic design of articualr cartilage at macro-level and micro-level is carried out from three aspects, i.e., structure, material, and function; and a bionic design model of articular cartilage is set up. As a result, this basic research would be helpful to providing theoretical and practical basis for innovational design and manufacturing of new-style artificial joint with "soft-cushion bearing", and of bionic artificial cartilage.

Association between TGF-α gene BaraH Ⅰ polymorphism and nonsyndromic cleft lip with or without cleft palate / 中华医学美学美容杂志

Objective Nonsyndromic cleft lip with or without cleft palate(NSCL/P)is a common craniofacial birth defect which results in lifelong medical and social consequences.Although Asians have the highest birth prevalence of oral-facial clefts,the majority of gene mapping studies of cleft lip with or without cleft palate(CL/P)have been in European or Ameriean Caucasians.Therefore,the obiective of this study was to evaluate association between transforming growth factor alpha(TGF-α)gene BamH Ⅰ polymorphism and NSCL/P in Chinese.Methods 107 patients with NSCL/P and 136 healthy controls were examined for TGF-α/BamH Ⅰ genotypes.TGF-α/BamH Ⅰ typing was carried out by digesting the locus specific polymerase chain reaction amplified products with alleles specific BamH Ⅰ restriction enzyme(PCR-RELP).Resuits A1 allele frequency was 0.06 and A2 allele frequency was 0.94 in the controls.A1 allele frequency was 0.14 and A2 allele frequency was 0.86 in patients with NSCL/P(x2=8.27,df=1,P＜0.05).A1 allele frequency was 0.17 and A2 allele frequency was 0.83 in the bilateral cleft lip with or without cleft palate.A1 allele frequency was 0.13 and A2 allele frequency was 0.87 in the unilateral cleft lip with or without cleft palate(x2=0.36,df=1,P＞0.05).There was no statistically significant between the case with family history and the case without family history(x2=0.34,df=1,P＞0.05).Conclusions The above data demonstrate that there is evidence for the association of TGF-α polymorphism with development of NSCL/P in Chinese.

On the Standardized Construction of Teaching and Research Section in Undergraduate Teaching Assessment / 中华医学教育探索杂志

An old educational mode is conducted in the teaching and research section for a long time,which is not in conformity with the development of higher education.It is urgent to strengthen the administration reform of the teaching and research section.It is significant in improving educational quality for a college to make the assessment of the educational level,and these activities promoted the management level of the teaching and research section.